<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button>点我触发事件</button>
    <script>
      /* 
        1. 获取dom
        2. 绑定事件
        */
      const btn = document.querySelector('button');

      //   btn.addEventListener('click', () => {
      //     console.log('点击了button -----> ');
      //   });

      //   等价
      //   btn.onclick = () => {
      //     console.log('点击了button -----> ');
      //   };

      //   再等价
      btn.onclick = () => console.log('点击了button -----> ');
    </script>
  </body>
</html>
